The new machine ought to (test) ______ before it is put to use.be tested新机器在使用之前

游客2023-10-09 46

问题 The new machine ought to (test) ______ before it is put to use.

选项

答案 be tested

解析新机器在使用之前要先做测试，根据句意，这里应该用被动语态。

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